If you work with an earlier version of the client app, you might have to
rewrite urls in multiple places but I figured it is still less work than running
the server yourself.

I hope that facilitates your working along with the Rock & Roll app and makes
your journey to Ember.js proficiency smoother. If you want to see the
screencast series in which I develop said application, you can sign up to my
mailing list and have each episode auto-delivered to your inbox.